[Tagdb] Tag Relevance

[Nitin Borwankar]

anand wrote:

> Hi,
>
> I have been involved in designing an information retrieval system that 
> takes tag meta-data into account as well. I figured out two approaches 
> to rank items based on the tag information:
>
>    1. Purely based on the number of users that have tagged that item.
>       Say item1 has been tagged by 10 users as tag1 and item2 by 20
>       users as tag1, then item1 would end-up having a higher ranking.
>

Did you actually mean item2 would have a higher ranking since it had 
more taggers.

>   1.
>
>
>    2. Based on the relative ranking of a tag when the collective
>       wisdom of the crowd is taken into account. To further the
>       explanation consider 2 items. Item1 has tags tag1(by 100 users)
>       and tag2(by 10 users). Item2 has tag2(by 10 users). When a user
>       searches for tag2, by approach 1 (above) ietm1 and item2 would
>       be comparable as both have 10 users tagging it as tag2. But in
>       this approach, item2 would be more relevant as for item1
>       although 10 users have tagged it as tag2, 100 users have (taking
>       collective wisdom into account) tagged it as tag1. Hence tag2
>       for item1 is relatively less relevant than tag2 for item2.
>


Interesting!

So here you are calculating something like the following normalized 
relevance ?

number of uses of  requested tag
---------------------------------------------------------
Sum over all tags ( number of instances of tag )


Nitin


>   1.
>
>
>
> In my opinion, approach 2 seems more reasonable as it takes into 
> account how people are collectively describing an object. But some 
> people beg to differ as they reason that tags need to be treated 
> individually and are independent of the other tags.
>
> Which do you think would yield better results? Your thoughts on the 
> same? Any other approach that you might have used?
>
> Thanks,
> Anand.
>
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Nitin Borwankar
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